Last night we experienced several systems on our three-member ICX7450 stack:
alarms about BGP sessions bouncing
could not SSH in via inband or OOB interfaces
received alerts from some attached devices that some LACP-enabled LAGs bounced a few times
SNMP-based graphs were not
ICMP-based pings timed our had high latency
Everything pointed to a high CPU.
We failed to get proper serial interface in place, so we power cycled unit #1 and then took the opportunity to upgrade from 09.0.10c to 09.0.10f. Unfortunately a few hours later we lost SSH, saw ICMP ping failures, and SNMP-based graphing, though we haven't seen any BGP sessions bouncing.
Via the serial interface we could see CPU 0 was high, and these are the processes that high: